Gas-liquid mixer for an aquarium



FIG. 1 is a left side, top and front perspective view of a gas-liquid mixer for an aquarium, showing our new design;

FIG. 2 is a right side, top and front perspective view thereof;

FIG. 3 is a front view thereof, with the rear view being a mirror image thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 4. 

The ornamental design for a gas-liquid mixer for an aquarium, as shown and described. 